linux-kernel - Re: [PATCH] slab+slob: dup name string

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Message-ID: <20120524001831.GQ25351@dastard>
Date:	Thu, 24 May 2012 10:18:31 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org, Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH] slab+slob: dup name string

On Wed, May 23, 2012 at 06:50:57PM +0400, Glauber Costa wrote:
> On 05/23/2012 06:48 PM, Christoph Lameter wrote:
> >On Wed, 23 May 2012, James Bottomley wrote:
> >
> >>>>So, why not simply patch slab to rely on the string lifetime being the
> >>>>cache lifetime (or beyond) and therefore not having it take a copy?
> >
> >Well thats they way it was for a long time. There must be some reason that
> >someone started to add this copying business....  Pekka?
> >
> The question is less why we added, but rather why we're keeping.
> 
> Of course reasoning about why it was added helps (so let's try to
> determine that), but so far the only reasonably strong argument in
> favor of keeping it was robustness.

I'm pretty sure it was added because there are slab names
constructed by snprintf on a stack buffer, so the name doesn't exist
beyond the slab initialisation function call...

Cheers,

Dave.

-- 
Dave Chinner
david@...morbit.com
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